This story is a sequel to The Fugitive Draconequus
Twilight's crown has been stolen by a mysterious thief from another world, and she has to go and get it back! But when Discord learns that nobody else can go with her, he decides to give her a secret item containing magical power... just in case she winds up needing it. But when Twilight runs into Discord's human counterpart in the other world, will she regret bringing Discord's magic into the other world?
Reading The Fugitive Draconequus is not be required to read this story, although reading it anyway will provide context to events in this story, and it would also be much appreciated.
The image of Discord in the coverart is from Derpibooru by the user Markiz93.